JP2012020634A - Load platform lifting device - Google Patents

Abstract

Provided is a load receiving table lifting device which can be operated in a good state among various usage forms.
A load receiving platform provided on a loading platform of a vehicle and moving up and down between the ground and the loading platform, an informing unit for notifying that the lifting operation of the loading platform is in a predetermined state, and a vehicle battery 30. And a notification unit 7 connected to each other, and a control unit 10 that controls the lifting operation of the cargo cradle. The control unit 10 detects a voltage of the vehicle battery 30 and an output of the voltage detection unit 12. It is configured to include a determination unit 13 that receives the signal and determines whether the notification unit 7 is on or off.
[Selection] Figure 2

Description

  The present invention relates to maintenance of a load receiving platform lifting device that supports loading and unloading work between a ground and a loading platform.

  The load receiving table elevating device has a configuration for moving the load receiving table up and down by using the expansion and contraction force of the hydraulic cylinder. The hydraulic cylinder is supplied with hydraulic oil by a hydraulic pump, and the hydraulic pump is driven by a motor.

  For example, in a load receiving platform lifting apparatus having a structure in which a pair of left and right support columns are erected on the rear side of a vehicle, a slider capable of moving up and down is arranged in the support column, and a load receiving platform is connected to and supported by the slider, as the slider moves up and down The load receiving platform also moves up and down along the support column. The hydraulic cylinder is arranged on a cross member erected between a pair of support columns. The expansion / contraction force of the hydraulic cylinder is transmitted as a lifting / lowering driving force of the slider via a wire having one end connected to the hydraulic cylinder and the other end fixed to the slider.

  A wire or the like that uses the expansion / contraction force of the hydraulic cylinder for raising and lowering the load receiving table is a power transmission unit, and a motor and a hydraulic pump that supply hydraulic oil to the hydraulic cylinder are driving units for raising and lowering the load receiving table. Periodic maintenance is indispensable because the aging of the drive unit and power transmission unit greatly affects the lifting performance of the load receiving platform.

  However, such drive units and power transmission units are often protected with a configuration that avoids external impacts. For example, a drive unit such as a motor is disposed in a resin case near the support column, and a power transmission unit such as a wire is disposed in the support column or the cross member. For this reason, it is difficult to visually recognize the secular change of the drive unit and the power transmission unit. In addition, since the drive unit and the power transmission unit are arranged in a narrow space, they are arranged in close proximity to other components, and the work of replacement and inspection becomes complicated.

  Therefore, the time for replacement and inspection is set in advance at the elapse of a predetermined period. Moreover, the structure which simplifies the exchange operation | work etc. in a support | pillar like patent document 1 is also employ | adopted. With these settings and proposals, maintenance is performed periodically, and costs related to parts replacement work and the like are reduced.

JP 2004-352170 A

  However, even if regular maintenance management is performed, there is room for improvement in terms of appropriate maintenance management suitable for the usage pattern because the usage pattern of the load receiving platform lifting apparatus varies from worker to worker.

  The load receiving platform lifting device is driven by the power supply of the vehicle battery when the vehicle is stopped. When the loading platform lifting device is excessively driven at the same location, for example, when the loading platform has been lifted and lowered or used for loading or unloading very heavy loads, the voltage of the vehicle battery The value is greatly reduced. In general, there is a vehicle that detects a voltage value fluctuation of a vehicle battery while the vehicle is running, but the voltage value when the vehicle is stopped is not managed. For this reason, when the voltage value of the vehicle battery is lower than the predetermined value, the vehicle battery does not function when starting the vehicle, and there is a possibility that the start of the stable vehicle is hindered.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a cargo receiving platform lifting / lowering device capable of preventing a large drop in the voltage value of a vehicle battery while the vehicle is stopped.

  The load receiving table lifting apparatus according to the present invention has the following configuration.

  A load receiving base provided on the loading platform of the vehicle and operated to be lifted and lowered between the ground and the loading platform, a notification unit for notifying that the lifting operation of the load receiving table is in a predetermined state, a vehicle battery, and the notification unit A control unit connected to control the lifting operation of the load receiving platform, the control unit detecting a voltage of the vehicle battery, and an output signal of the voltage detection unit, It is set as the load receiving table raising / lowering apparatus which has the determination part which determines ON or OFF.

  Here, “the lifting operation of the cargo cradle is in a predetermined state” means that the voltage value of the vehicle battery, which is also used as a power source for driving the cargo cradle lifting device, is such that the vehicle can start in a stable state. Is a state where the vehicle battery does not have. By detecting and notifying this state, the operator can determine whether the operation of the load receiving platform lifting device is necessary. In other words, it is possible to prevent a large decrease in the voltage value of the vehicle battery that hinders stable vehicle start.

  In addition to the above-described configuration, the load receiving table lifting device includes a drive unit that drives the load receiving table to be moved up and down, and an operation unit that performs a lifting command of the load receiving table, which are connected to the control unit. It further has an operation detection unit that detects an operation signal of the operation unit, and the determination unit receives an output signal of at least one of the voltage detection unit and the operation detection unit and determines whether the notification unit is on or off. It is possible to adopt a configuration having a determination unit to perform.

  In such a configuration, “the lifting and lowering operation of the load receiving platform is in a predetermined state” means “a state where the voltage value of the vehicle battery is greatly reduced” or “an operation exceeding a preset number of times or time from the operation unit”. It indicates a state where a signal is being output. If these states are detected, it is possible to turn on the notification unit because the lifting operation of the load receiving platform is excessively performed and the state is not appropriate.

With the above configuration, the worker can stop the lifting operation of the load receiving table, limit the number of times of use, or perform parts replacement at an appropriate timing. The device can be activated.
The operation detection unit may include a measurement unit that measures the number of operations of at least one of an ascending operation and a descending operation of the load receiving platform.
The operation detection unit may include a measurement unit that measures an operation time of at least one of an ascending operation and a descending operation of the load receiving platform.

  By measuring the number of operation times or the operation time for carrying out the load receiving platform as described above, the operation detecting unit can correspond to the load receiving platform lifting device of various usage forms. Depending on the number of operation times or operation time, replacement of parts and inspection work can be performed as appropriate.

  Furthermore, it has a switching part which switches connection or interruption | blocking between the said drive part and the said control part, and the said switching is controlled by the detection signal of at least one of the said voltage detection part or the said operation detection part. It can also be configured.

  By having the switching unit, when the “lifting / lowering operation of the cargo cradle is in a predetermined state”, the lifting / lowering operation of the cargo cradle can be stopped, so from the predetermined state, the vehicle battery, the drive unit, or the power It can prevent that a load is further applied to a transmission part.

  The determination unit may further include a drive detection unit that detects the drive of the drive unit. By providing the drive detection unit, it is possible to immediately and accurately cope with the secular change of the drive unit.

  By adopting the configuration of the present invention, the operator can stop the lifting operation of the loading platform, limit the number of times of use, or perform parts replacement at an appropriate timing, and the loading platform lifting device in a good state. Can be activated.

(A) is a principal part perspective view of the load receiving stand raising / lowering apparatus which concerns on 1st Embodiment, (b) is a side view which shows the raising / lowering state of a load receiving stand. It is a sequence circuit diagram of the load receiving table raising / lowering apparatus which concerns on 1st Embodiment. It is a flowchart in the determination part which concerns on 1st Embodiment. It is a sequence circuit diagram of the load receiving table raising / lowering apparatus which concerns on 2nd Embodiment.

Embodiments according to the present invention will be described with reference to the drawings.
(First embodiment)

  FIG. 1A is a perspective view of a main part of the cargo receiving table lifting device 100. The load receiving platform lifting device 100 includes a pair of left and right columns 1 erected at the rear end of the vehicle, a slider 2 that can be moved up and down inside the column 1, a load receiving table 3 supported by the lower end of the slider 2, and a column 1. A hydraulic cylinder 5 disposed in a cross member 8 installed between the control unit 6, an operation unit 6 for operating the lifting and lowering of the load receiving table 3, and a notification unit 7 for performing notification regarding the state of the lifting operation of the load receiving table 3. ing.

  The support column 1 is provided with a notch 1a on the rear wall, and the lower end 2a of the slider 2 protrudes rearward from the notch 1a. The load receiving stand 3 is pivotally supported so as to be rotatable in the vertical direction with respect to the lower end 2a.

  One end of the wire 4 is fixed to the upper ends of the left and right sliders 2, guided upward from the slider 2, and folded downward by a sheave 21 provided on the upper portion of the column 1. The other end portion of the folded wire 4 is guided downward, and is guided from the lower portion of the support column 1 to the hydraulic cylinder 5 via a sheave (not shown) and is appropriately fixed.

The hydraulic cylinder 5 extends and retracts to move the wire 4 to the column 1 or pull it from the column 1 to move the slider 2 up and down. In this way, the expansion / contraction force of the hydraulic cylinder 5 is used as power for raising and lowering the slider 2, and is transmitted to the slider 2 through a power transmission unit such as the wire 4. As the slider 2 moves up and down, the load receiving table 3 is also moved up and down along the support column 1.

  The lifting operation of the load receiving platform 3 is performed by the operator pressing an operation button provided on the operation unit 6. The operation unit 6 is provided in a resin case 9 disposed on the left side portion behind the vehicle. Although not shown, the resin case 9 has a configuration in which a drive unit that drives the lifting and lowering of the load receiving table 3 is arranged inside, and the drive unit is configured by an electric motor, a hydraulic pump, a control valve, and the like. ing. The hydraulic oil is supplied to the hydraulic cylinder 5 in response to an operation command from the operation unit 6 via the drive unit.

  The alerting | reporting part 7 is provided in the side wall of the support | pillar 1, and LED is used as a light emission part. When the number of times the ascent of the cargo cradle 3 reaches a predetermined number, when the ascending command is output over a predetermined continuous time via the operation unit 6, or when the vehicle battery is in the ascending operation of the cradle 3 When the value is less than or equal to the value, the notification unit 7 is driven to notify the worker.

  The load receiving table lifting device 100 is operated as shown in the side view of FIG. The cargo cradle 3 is stored in a state 3a that stands up at the rear of the vehicle like a one-dot chain line when the vehicle travels. When using the load receiving table lifting device 100, the load receiving table 3 is manually rotated to the horizontal state 3b (arrow A1) and lowered to the grounding state 3c while maintaining the horizontal state (arrow A2). In the horizontal state 3b, the load receiving platform 3 has the same height as the floor F of the load platform.

  The raising / lowering operation of the cargo receiving platform 3 is performed by operating two types of buttons 61 and 62 provided on the operation unit 6. When the ascending button 61 that outputs the ascending command is continuously pressed (on state), the cargo receiving platform 3 is raised, and when the button 61 is not pressed (off state), the ascending operation is stopped. Further, when the lowering button 62 that outputs the lowering command is continuously pressed (on state), the cargo receiving table 3 is lowered, and when the button 62 is not pressed (off state), the lowering operation is stopped.

  Thus, when raising and lowering the cargo receiving platform 3 and the notification by the notification unit 7 is performed, the operator can recognize that the operating state for raising and lowering the cargo receiving platform 3 is not good. In particular, since the notification unit 7 and the operation unit 6 are provided on the same side of the vehicle (the left side of the vehicle), it is easy to recognize during the lifting operation.

  The load receiving table lifting device 100 has a sequence circuit shown in FIG. This circuit has a configuration in which the drive unit 20, the operation unit 6, and the control unit 10 that controls the lifting operation of the load receiving platform 3 can receive power from the vehicle battery 30. The control unit 10 determines whether the lifting / lowering operation of the cargo receiving platform 3 is acceptable. In the control unit 10, power is supplied from the vehicle battery 30 by turning on or off the main switch 40 provided in the cab. In addition, although the drive part 20 points out the unit part of the components which supplies hydraulic oil to the hydraulic cylinder 5, in FIG. 2, the motor M which comprises the unit part is illustrated as the representative.

  The control unit 10 is connected to the vehicle battery 30, the drive unit 20, the operation unit 6, and the notification unit 7, and receives a rising command from the operation unit 6 to control the drive unit 20 and the like. (Central processing unit) 10a, an operation detection unit 11 that detects a rising command of the operation unit 6, a voltage detection unit 12 that detects a power supply voltage supplied from the vehicle battery, and the operation detection unit 11 or the voltage detection unit 12 And a determination unit 13 that performs on / off switching control of the notification unit 7 based on at least one of the detections.

  The operation detection unit 11 includes a time counter side unit 11a that measures the time during which the ascending command for the cargo receiving table 3 is output, and a frequency measuring unit 11b that measures the number of times the cargo receiving table 3 is raised. In the present embodiment, the operation detection unit 11 includes both the measurement units 11a and 11b. However, the operation detection unit 11 may include only one of the measurement units 11a and 11b.

  The time measuring unit 11a outputs a signal to the determination unit 13 when the ascending button 61 is pressed, and in a state where the ascending button 61 is continuously pressed, the determination unit 13 continues while the button is continuously pressed. Signal output. When the determination unit 13 receives a continuous output signal of a predetermined time TS (for example, 15 seconds) or more from the time measurement unit 11a, the determination unit 13 outputs a signal that informs the notification unit 7 in the on state to the notification unit 7. The predetermined time TS is set as a time for driving the notification unit 7 in advance so that the motor M is continuously driven by continuously pressing the ascending button 61 and the motor is not burned. Thereby, a worker can be alerted. By being notified by the notification unit 7, the operator can recognize the excessive driving of the motor M and cancel the state in which the ascending button 61 is continuously pressed. In the present embodiment, when the ascending button 61 is not pressed, the ascending operation of the load receiving platform 3 is set to be stopped. However, once the ascending button 61 is pressed, the cargo receiving platform 3 is not operated until the ascending button 61 is pressed again. In the case where the ascending operation is continuously performed, the operator may forget to press the ascending button 61 again. In such a case, it is particularly useful that the notification by the notification unit 7 is performed when the predetermined time TS is reached.

  The number measuring unit 11b measures the number of times the cargo receiving platform 3 is moved up and down and outputs a signal to the determining unit 13 every time the number of times increases. When the number of times of raising and lowering the cargo receiving platform 3 reaches a predetermined number E (for example, 8,000 times), the determination unit 13 outputs a signal for informing the notification unit 7 that the notification unit 7 is turned on. The predetermined number E is set by examining in advance the number of times that the stretched wire 4 is easily bent and the motor brush is easily worn. By setting the predetermined number of times so that the operator can recognize it, it is necessary to appropriately grasp the timing of performing maintenance in accordance with the actual operation of the drive unit 20 and the power transmission unit (wire, sheave, etc.). Can do.

  A contactor CT is disposed between the control unit 10 and the drive unit 20. The contactor CT is in a closed state in synchronization with switching of the ascending button 61 of the operation unit 6 to the ON state, and outputs an ascending command from the operation unit 6 via the CPU 10a to the drive unit 20.

  The control unit 10 is further provided with a switching unit 50 that switches the connection between the CPU 10 and the contactor CT to the “connected state” or the “cut-off state”. The switching unit 50 is also connected to the time measuring unit 11a, and is set to perform the above switching in response to an output signal from the time measuring unit 11a. For example, when the time measuring unit 11a is in a state in which the ascending button 61 is continuously pressed for a predetermined time TL (for example, 20 seconds) or longer, the switching unit 50 is set to change from the “connected state” to the “blocked state”. ing. Thus, when switched to the “blocking state”, the ascending command from the operation unit 6 is forcibly blocked and the driving of the motor M is stopped. The predetermined time TL is set to a time longer than the time TS serving as a threshold for the notification unit 7 to be notified, thereby unexpectedly stopping the driving of the motor M and affecting the lifting operation of the operator. Although this can be prevented, the length of the predetermined time TL may be set to the same value as the time TS. In the present embodiment, the switching unit 50 performs switching corresponding to the output signal of only the time measuring unit 11a. However, both the measuring units 11a also perform the setting corresponding to only the output signal of the number measuring unit 11b. , 11b may be set corresponding to the output signal.

  In this way, according to the operation status by the operation detection unit 11, the notification unit 7 is driven, or the drive of the drive unit such as the motor M is regulated, thereby quickly dealing with performance deterioration due to aging of the drive unit. it can.

  The voltage detection unit 12 detects the voltage value of the vehicle battery 30 using a voltmeter and outputs a signal to the determination unit 13. In the determination part 13, when the voltage value becomes below a predetermined value, the signal which alert | reports the alerting | reporting part 7 is output to the alerting | reporting part 7. FIG. Since the load receiving platform lifting / lowering device 100 is operated while the vehicle is stopped, the voltage value decreases while the vehicle is stopped. Therefore, by detecting the voltage value, when a large drop in the voltage value occurs due to excessive use of the load receiving platform lifting device 100, the operator is notified via the notification unit 7, and the vehicle cannot start. The situation can be avoided. That is, the voltage value serving as the threshold for the determination unit 13 to output to the notification unit 7 is a value that ensures a stable start of the vehicle.

The time measurement unit 11 a and the voltage detection unit 12 are each provided with a connection unit using the galvanic terminals 110 and 120 between the vehicle battery 30. The on / off state of the connection with the vehicle battery 30 can be switched by connecting / disconnecting the terminal 110, 120. Once the terminal 110, 120 is disconnected, the accumulated measurement data and detection data are reset. ing. That is, when measurement or detection is performed again after the notification unit 7 is driven by the time measurement unit 11 a or the voltage detection unit 12, new measurement or detection can be performed by disconnecting the giboshi terminals 110 and 120.
The cargo receiving platform lifting apparatus 100 using the control unit 10 having the above-described configuration is operated according to the procedure of the flowchart of FIG.

  First, the operator prepares to operate the cargo receiving table lifting device 100 (S1). Specifically, after the vehicle stops, the main switch 40 is turned on, the load receiving platform 3 is brought into the horizontal state 3b, and the lowering button 62 is continuously pressed to bring the load receiving platform 3 into the grounding state 3c (see FIG. 1B). . After loading the load on the receiving platform 3 in the grounded state 3c, the ascending button 61 is pushed.

  At this time, the voltage detection part 12 has detected the voltage value of the vehicle battery 30 (S2). If the detected voltage value is equal to or greater than a predetermined value, the notification unit 7 is not driven, the motor M is driven in response to the ascent command, and hydraulic oil is supplied to the hydraulic cylinder 5 by the hydraulic pump, and the load receiving platform 3 is raised. (S3). On the other hand, if the voltage value is equal to or lower than the predetermined value, the notification by the notification unit 7 is performed when the main switch 40 is turned on (S9).

  While the lift button 61 is kept pressed, the load receiving platform 3 is lifted, but the lift button is continuously lifted up to the uppermost position (horizontal state 3b) as shown in FIG. When the state 61 is pressed, that is, when the time T (for example, 5 to 10 seconds) required to ascend from the ground state 3c to the horizontal state 3b is reached, the number of times of raising and lowering is N (= 0, 1, 2, 3, ...) to N + 1 times (S4). On the other hand, the driving of the motor M is stopped when the ascending button 61 is not continuously pressed for more than the time T, for example, when the ascending button 61 is not pressed (off state) (S5). When the ascending button 61 is pressed again, the motor M is driven and the ascending operation is performed. As described above, before the motor M is stopped (time TS has elapsed), notification by the notification unit 7 is performed (S9).

  When the ascending button 61 exceeds the time T and reaches the time TL, the motor M may be burned out, and the driving of the motor M is set to be forcibly stopped (S5). Here, the time TL serving as a threshold for forcibly stopping the motor M is, for example, a time that is twice the continuous ascending time T, and is sufficiently grounded if the ascending button 61 is kept pressed. This is the time for moving from 3c to the horizontal state 3b.

  On the other hand, even if the ascending button 61 is not pressed before the time TL to stop the motor M (OFF state), if the main switch 40 remains in the ON state, the lifting operation of the load receiving platform 3 is repeated. Done. Therefore, after the lowering button 62 is pressed and the load receiving table 3 is brought into the grounded state 3c (S6), the raising button 61 is pressed and the lifting / lowering operation procedure of the load receiving table 3 is similarly repeated (S7). When such a raising / lowering operation is repeated and the total number of times of raising / lowering reaches a preset number E, for example, 8,000 times (S8), driving of the notification unit 7 that prompts maintenance of the drive unit 20 and the power transmission unit is set. (S9).

  With regard to the ascending duration T used for measuring the number of times the ascending / descending table 3 is moved up / down, the ascending button is continuously pushed in a state where no load is loaded on the receiving table 3 and the position of the horizontal state 3b from the ground (FIG. 1B). (Refer to)) is the time required to reach (continuous rise time). When no load is placed on the load receiving platform 3, the highest rising speed can be obtained as compared with the state where the load is placed, so that the rising time from the ground contact position is the shortest. Therefore, in order to raise the load receiving table 3 on which the load is loaded to the position near the horizontal state 3b, the ascending button 61 is pressed at least for the continuous rising time T (the load receiving table 3 is raised). Is required. In addition, in order to measure the number of times the cargo receiving table 3 is moved up and down, not only the time conversion based on the rising measurement time T as described above but also a limit switch that functions when the cargo receiving table 3 is in the horizontal state 3b is arranged. It is good also as a structure which measures the frequency | count of direct. Note that the determination unit 13 has a storage unit (not shown), and stores the number of times of ascending and descending measured by the storage unit.

As described above, the detection by the time measurement unit 11a, the number measurement unit 11b, and the voltage detection unit 12 is performed, so that it is determined whether or not the lifting / lowering operation of the load receiving platform 3 is in a good state. Can be notified. Therefore, the worker can grasp the secular change due to the actual operation of the cargo receiving platform lifting / lowering apparatus 100, and can perform efficient maintenance management at an appropriate timing. That is, when the usage frequency is high, the secular change of the wire or the like can be determined based on the usage frequency, and the function receiving elevator 1 is not greatly degraded. In addition, when the frequency of use is low, it can be determined that there is no deterioration of the wire etc. at the time assumed in advance, so that replacement work with a large number of work steps can be avoided and cost effectiveness of the wire etc. can be reduced. It can also be increased. The hydraulic cylinder is driven by a known hydraulic circuit device, and a hydraulic pump driven by a motor supplies and discharges hydraulic oil. As the number of times of raising and lowering the load receiving table 3 is increased, the deterioration of the motor also appears. In particular, the deterioration of the brush portion becomes remarkable and the energization efficiency is greatly reduced. According to the measurement management of the present embodiment, it is possible to perform replacement work such as a brush that requires a particularly large number of work steps at an appropriate timing.
(Second Embodiment)
The load receiving platform elevating device 200 of this embodiment has a sequence circuit different from that of the first embodiment and will be described with reference to FIG.
The control unit 200 includes only the number counting unit 11 b as an operation detection unit that detects an operation signal of the operation unit 6, and includes a drive detection unit 201 that detects a drive state of the drive unit 20.

The drive detection unit 201 detects the temperature of the motor M of the drive unit 20 and outputs a signal to the determination unit 13. In the determination part 13, it is compared whether it is higher than the preset temperature of the motor M, and when the detected temperature becomes higher than the set temperature, the notification part 7 is driven. The determination unit 13 may be set not to simply determine whether the temperature is high or low, but to make a determination based on the rate of temperature increase per unit time. By having the drive detection unit 201, the control unit 200 can determine whether or not the drive unit 20 is in a predetermined state in the lifting operation of the load receiving platform 3. The drive detection unit 201 is connected to the drive unit 20 via the burrow terminal 210, and when the burrow terminal 210 is removed, the accumulated data in the drive detection unit 201 is reset. In addition, regarding the drive detection part 201, what detects the temperature of hydraulic fluid, what detects the tension | tensile_strength force of the wire 4, and what detects other drive force and output power transmission force may be used.
(Other matters)

  Regarding the output of the lifting command of the load receiving platform 3, the operation unit 6 is provided on the resin case disposed on the rear side of the vehicle. However, the present invention is not limited to this, and is wired or wireless in a form that can be gripped by the operator. An expression operation unit may be used.

  Regarding the measurement of the number of times of raising and lowering the receiving platform 3, in addition to the method of measuring the number of times by the continuous ascending time T, a method of measuring the number of times of descent or a method of measuring the number of times of ascent and descent may be applied. I do not care.

  The LED of the notification unit 7 emits light when the number of times of measurement reaches the predetermined number of times input to the determination unit 13. In addition to the light emission timing, the LED 7 emits light in a short time corresponding to a different timing set in advance. May be added. For example, if the configuration is such that light is emitted whenever the number of times of raising / lowering increases, such as t + 1, t + 2,..., Or the light is emitted every time a preset time (for example, 100 seconds) is reached, notification by the notification unit 7 is performed. Even if the LED does not emit light up to the number of times (for example, 20,000 times), it can be confirmed that the function of the notification unit 7 is operating without failure.

  As for the installation position of the notification unit 7, any other position may be used as long as it is easy for the operator to confirm. For example, when a wired device that is large enough to be held by an operator is used as the operation unit, the notification unit 7 may be provided in the device.

  Regarding the number of the notification units 7, all the information on the operation time or the number of times of rising of the cargo receiving platform 3 and the voltage value of the vehicle battery is displayed by one LED. The corresponding LEDs may be individually displayed based on the information.

Further, the notification format is not limited to the light emission format using LEDs or the like, and other light emitting members may be used. Furthermore, it does not matter as a format informing with sounds such as a buzzer.
Regarding the present invention, by providing a display device for displaying the number of ascents, it is possible to more appropriately measure and manage the number of ascents of the cargo cradle.

  Further, regarding the setting of the continuous rise time T, it may be appropriately set in consideration of the viscosity of the hydraulic oil based on changes in the external environment such as temperature and climate. In addition, since the working environment of the load receiving platform lifting / lowering apparatus 100 is various, it is possible to set the number of times of lifting / lowering to be increased once by considering a slight variation and the time when the continuous rising time T is “approximately the same time”.

  For example, when the lift button 61 is unexpectedly released while the load receiving platform 3 is being lifted and the lift receiving button 61 is pressed again immediately to raise the load receiving platform 3, the total amount until the load receiving table 3 is in the horizontal state 3 b is expressed as “omitted. It is good also as "time to coincide." That is, the time required for the load receiving platform 3 to rise from the ground to the level of the horizontal state 3c (the sum of “time when the lift button 61 is pressed” and “time when the lift button 61 is released”) is set as the continuous increase time T. Also good. Further, only the “time when the ascending button 61 is pressed” except the “time when the ascending button 61 is released” may be used as the continuous ascending time T. Further, when the load receiving platform 3 rises to near the height of the horizontal state 3b, the operator intermittently lifts the load receiving platform 3 by pressing the lift button 61 intermittently, and performs a fine adjustment of the height position. Even in this case, the time required to rise to the height of the horizontal state 3c may be set as the continuous rising time T, or the total of the pressing time of the rising button 61 may be set as the continuous rising time T.

In addition, when the vehicle stops on an inclined ground, or when a load is loaded at a position higher than the ground, a time shorter than the preset rising duration T may be set as the continuous rising time T.
In the above-described embodiment, “rising” of the receiving platform is used as the measurement index. However, the present invention is not limited to this, and “down” may be used as the measurement index.

  In addition, when using the cargo receiving platform lifting apparatus 100 immediately after the vehicle stops, the voltage of the vehicle battery is higher than after a certain amount of time has elapsed since the vehicle stopped, so the motor driving force increases, The load receiving platform 3 can be raised to the height of the horizontal state 3b in a shorter time than the set continuous increase time T. On the other hand, the viscosity of the hydraulic oil or the like may change due to a change in the external environment, and may take a slightly longer time than the set continuous increase time T. Therefore, the rise duration time T may be set in consideration of a certain amount of time fluctuation.

  The up and down commands are based on the condition that the ascending button 61 or the descending button 62 is kept pressed, but once the button is pressed, the command state is maintained, and the command is issued by pressing the button again. You may make it cancel. The operation unit 6 is provided with only two types of buttons, but may be configured to operate with one button or three or more buttons.

DESCRIPTION OF SYMBOLS 1 Support | pillar 2 Slider 3 Load receiving stand 4 Wire 5 Hydraulic cylinder 6 Operation part 7 Notification part 10 Control part 11 Operation detection part 11a Time measurement part 11b Count measurement part 12 Voltage detection part 13 Determination part 20 Drive part 30 Vehicle battery 40 Main switch 50 Switching unit 61 Up button 62 Down button

Claims (6)

A loading platform that is provided on the loading platform of the vehicle and is moved up and down between the ground and the loading platform;
An informing unit for informing that the raising and lowering operation of the load receiving platform is in a predetermined state;
A control unit connected to a vehicle battery and the notification unit to control the lifting operation of the load receiving table;
With
The control unit includes a voltage detection unit that detects a voltage of the vehicle battery, and a determination unit that receives an output signal of the voltage detection unit and determines whether the notification unit is on or off. lift device. A drive unit for raising and lowering the load receiving table;
An operation unit for instructing to raise and lower the load receiving table;
Is connected to the control unit,
The control unit further includes an operation detection unit that detects an operation signal of the operation unit,
The said determination part has a determination part which receives the output signal of at least any one of the said voltage detection part and the said operation detection part, and determines the ON or OFF of the said alerting | reporting part. Loading platform lifting device. The said operation detection part has a measurement part which measures the frequency | count of operation | movement of at least any one of the raising operation | movement of the said cargo receiving stand, or a descent | fall action. The cargo receiving stand raising / lowering apparatus of Claim 2. The said operation detection part has a measurement part which measures the operation time of at least any one of the raising operation | movement of the said cargo receiving stand, or a descent | fall action. The cargo receiving stand raising / lowering apparatus of Claim 2 characterized by the above-mentioned. A switching unit that switches connection or disconnection between the drive unit and the control unit;
The said receiving switch raising / lowering apparatus of Claim 3 or 4 controlled by the detection signal of at least any one of the said voltage detection part or the said operation detection part. The said receiving part further has a drive detection part which detects the drive of the said drive part. The cargo receiving stand raising / lowering apparatus in any one of Claim 1 to 5 characterized by the above-mentioned.

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